Circles

The equation of the circle centered at $O(0,0)$ with radius 5 is ...

The equation of the circle centered at $(2,3)$ with radius 4 is ...

The center of the circle $x^2+y^2-4x+6y-3=0$ is ...

The radius of the circle $x^2+y^2=49$ is ...

The point that lies on the circle $x^2+y^2=25$ is ...

The equation of the circle centered at $O(0,0)$ passing through $(6,8)$ is ...

The center and radius of the circle $x^2+y^2+8x-2y-8=0$ are respectively ...

The radius of the circle $x^2+y^2+6x-4y-12=0$ is ...

The equation of the circle centered at $(1,-2)$ passing through $(4,2)$ is ...

The general form of the circle centered at $(3,2)$ with radius 5 is ...

The position of the point $(2,3)$ relative to the circle $x^2+y^2+2x-6y+5=0$ is ...

The circle $x^2+y^2=r^2$ is tangent to the line $3x+4y-10=0$. The value of $r$ is ...

The tangent line to the circle $x^2+y^2=25$ at $(3,4)$ is ...

The tangent line to the circle $x^2+y^2=13$ at $(2,3)$ is ...

The line $y=x+k$ is tangent to the circle $x^2+y^2=8$. The possible values of $k$ are ...

The equation of the circle centered at $(2,1)$ and tangent to the $x$-axis is ...

The equation of the circle centered at $(1,-3)$ and tangent to the line $3x+4y-26=0$ is ...

The equation of the circle with diameter $PQ$, where $P(1,2)$ and $Q(5,8)$, is ...

The radius of the circle $x^2+y^2-4x+6y-12=0$ is ...

The number of intersection points of the line $y=2x-3$ with the circle $x^2+y^2=9$ is ...